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MIL:E-48441A(MU)
photometer having a 7 millimeter aperture and appropriate filters$ shall
be positioned such that it intercepts the line of sight from the exit
lens of the eyepiece. The light source shall present a uniform target
luminance greater than 100 foot lamberts, by means of a tungsten lamp
held at a constant temperature 2870 1OOK. The transmittance measurements
shall be made with the eyecorrected photometer, and shall not be less
than the value specified in 3.6.1.4.2. The percentage of transmittance
shall be computed using the following formula:
Luminance of source as seen through Eyepiece Assembly x 100
% Transmittance =
Luminance of source
4.6.3 Environmental.
4.6.3.1 Storage temperatures.- This test shall be performed on
elbow assemblies procured as a repair part item. When the elbow assembly
is provided with a complete periscope this temperature test will not be
required when the complete periscope is subjected to temperature cycling.
The testing equipment utilized in this test shall be in accordance with
the "Test Facilities'i requirements of MIL-F-13926 and the conditions of
3.4.1. The elbow assembly shall be placed in the test chamber and the
temperature of the chamber reduced gradually (see NOTE below) to -80F.
The elbow assembly shall remain at this temperature for a minimum of 5
hours. At the completion of this 5 hour period, the temperature of the
test chamber shall be gradually raised (see NOTE below) to +160F. The
elbow assembly shall remain at this temperature for a "minimum of 5
hours. At the completion of this 5 hour period, the temperature of the
test chamber shall be gradually reduced to room ambient temperature
(+60 to +90F), and the elbow assembly removed from the. test chamber.
The elbow assembly shall then be subjected to the visual, tactile, and
audible examination of 4.6.5.4. The elbow assembly shall conform to the
requirements of 3.4.1.
NOTE: The rate of temperature change in the test chamber shall not
exceed 20 degrees per hour throughout the temperature cycling
tests of 4.6.3.1 and 4.6.3.2.
4.6.3.2 Operating temperatures.- This test shall be performed on
elbow assemblies procured as a repair part item. When the elbow assembly
is provided with a complete periscope this temperature test will not be
required when the complete periscope is subjected to temperature cycling.
The test equipment utilized in this test shall be in accordance with the
"Test Facilities" requirements of MIL-F-13926 and the conditions of
3.4.2. The elbow assembly shall be placed in the test chamber and the
temperature of the chamber reduced  gradually (see NOTE in 4.6.3.1) to -
40F. The elbow assembly shall remain at this temperature for a minimum
of 5 hours. t the completion of this 5 hour period and while at -40F,
the elbow assembly shall. be subjected to the tests in 4.6.4 to determine
compliance with the applicable requirements of 3.5, for this temperature
(-40F). Upon completion of this test, the temperature of the test
chamber shall be gradually raised (See NOTE in 4.6.3.1) to +150F. The
elbow assembly shall remain at this temperature for a period of 5 hours.
16

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